State Route 121, I-5 to I-5


MP: .06

Location: I-5 and Maytown Rd SE, Maytown

Junction I-5 and Maytown Rd, the beginning of SR 121


MP: 2.52

Location: Maytown Rd SE and Tilley Rd S, Maytown

SR 121 turns left onto Tilley Rd S with little signage. It heads to Millersylvania State Park


MP: 7.51

Location : I-5 and 93rd Ave SW, Tumwater

SR 121 goes by the state park and turns onto 93rd Ave SW without signage. It ends at I-5 just south of Tumwater


N to US-101, S to SR 121

N to SR 121, S to US-12